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Dimensional stability and weight changes of tissue conditioners
H Murata1, M Kawamura, T Hamada
1Department of Prosthetic Dentistry, Hiroshima University Faculty of Dentistry, Hiroshima, Japan. hmurata@hiroshima-u.ac.jp
Tissue conditioners are crucial for accurate oral impressions. Most conditioners shrink and lose weight over time, except SR-Ivoseal which expands. Optimal impression time is 24 hours.
Area of Science:
- Dental Materials Science
- Biomaterials Engineering
Background:
- Tissue conditioners are vital for creating functional impressions of oral mucosa.
- Dimensional stability is a key characteristic influencing the accuracy of these impressions.
Purpose of the Study:
- To evaluate the linear dimensional changes and weight changes of six tissue conditioners over time.
- To determine the relationship between dimensional changes, weight changes, water absorption, and solubility.
- To identify the optimal time for obtaining functional impressions.
Main Methods:
- Six tissue conditioners were tested: COE Comfort, FITT, GC Soft-Liner, Hydro-Cast, SR-Ivoseal, and Visco-Gel.
- Linear dimensional changes and weight changes were measured using a travelling microscope at various time points up to 21 days.
- Water absorption and solubility were determined for each material.
Main Results:
- Most materials (except SR-Ivoseal) exhibited shrinkage and weight loss in water, indicating higher solubility than absorption.
- SR-Ivoseal showed expansion and weight gain.
- A strong positive linear relationship (r=0.797–0.986, P < 0.05) was observed between dimensional and weight changes.
- Dimensional stability varied significantly among the tested materials.
Conclusions:
- Water absorption and solubility significantly influence the dimensional stability of tissue conditioners.
- The optimal period for achieving functional impressions with these materials is suggested to be 24 hours post-insertion.
- Selection of appropriate tissue conditioners is critical due to observed variations in dimensional stability.
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